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SHARP 15JF25S
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of SHARP 15JF25S Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Text excerpt from page 9 (click to view)
15JF-25S

• Screen Adjustment
1. G2 Adjustment 1. 2. 3. 4. 5. 6. 7. 8. 9. Enter the Service Mode (see page 6). Use the channel up or channel down buttons to enter the << BLUE-BACK >> function. Set this to << BLUE-BACK: 0 >>, i.e. blue background is turned off. Turn the set off at the mains. Turn the set back on. Set the picture control settings to normal. Select the SCART input by pressing the TV/SCART button on the remote control. Do not connect an input to the SCART socket. A blank raster will appear. Connect an oscilloscope to TP852 on the CRT PWB. The waveform as in figure 4 should be displayed. Adjust the G2 control (screen voltage) so that the peak of this waveform is 3.0V +/-0.1V above the zero volt line.

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9

9
Figure 4

10. Enter the Service Mode. 11. Turn the blue background function back on again - set << BLUUE-BACK: 1 >>. 12. Turn off the receiver using the mains button. 13. The G2 adjustment is now complete.

2. Focus Adjustment 1. 2. 3. Receive a monoscope pattern signal at a level of 60 to 80 dB/µV. Set the picture settings to normal. Adjust the focus potentiometer to obtain maximum definition.

• AGC Adjustment
1. 2. 3. 4. 5. 6. 7. 8. Tune the receiver into a colour bar signal on channel E-12. Set the RF generator to an output signal strength of 57dB/µV (+/-1dBµV) –50 Ohms unbalanced. Connect an oscilloscope to TP201. TP201 is one end of R201. Enter the Service Mode (see page 6). Use the channel up and channel down buttons to enter the AGC mode. By using the volume up and the volume down buttons, adjust the AGC until the voltage on TP201 drops by 0.1V to 0.3V below its maximum value. Change the input signal strength to 66-70 dB/µV and make sure that there is no noise apparent in the picture. Turn the receiver off at the mains, this will exit the Service Mode and store the adjustment.

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